everything is perfectly fine in my tank all my parameters are on point I checked , 0 ammonia 0 nitrite 5.0 nitrates 79 degrees. my jags appetite is low. he just doesn't seem very interested in food its almost like hes spoiled or just content on a semi empty stomach. he used to eat like a cow now he eats even less than my 4 inch Cuban. hes 8 inches at the moment. is this normal.